Damage-constitutive model for seawater coral concrete using different stirrup confinements subjected to axial loading

doi:10.1007/s11709-022-0913-2

Front. Struct. Civ. Eng.

2023, Vol. 17

Issue (3) : 429-447 https://doi.org/10.1007/s11709-022-0913-2

RESEARCH ARTICLE

Damage-constitutive model for seawater coral concrete using different stirrup confinements subjected to axial loading

Jiasheng JIANG^1,², Haifeng YANG^1,²(

), Zhiheng DENG^1,², Yu ZHANG^1,²

¹. Guangxi Key Laboratory of Disaster Prevention and Structural Safety, College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China
². Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education, Guangxi University, Nanning 530004, China

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Abstract

Recently, the application of detrital coral as an alternative to natural aggregates in marine structures has attracted increased attention. In this study, research on the compressive performance of coral aggregate concrete (CAC) confined using steel stirrups with anti-rust treatment was experimentally conducted. A total of 45 specimens were cast, including 9 specimens without stirrups and under different strength grades (C20, C30, and C40) and 36 specimens under different strength grades (C20, C30, and C40). Moreover, three stirrup levels (rectangular, diamond-shaped compound, and spiral stirrups) and different stirrup spacings (40, 50, 60, and 70 mm) were used. Subsequently, the stress−strain curves of specimens subjected to axial loading were measured. The effects of the stirrup spacing and stirrup configurations on the stress and strain were investigated, respectively, and the lateral effective stress of the different stirrups was calculated based on the cohesive-elastic ring model and modified elastic beam theory. Moreover, a damage-constitutive model of CAC considering the lateral stress was set up based on damage mechanics theory. The results indicated an increase in the stress and strain with a decrease in the stirrup spacing, and the adopted stirrup ratio had a better strengthening effect than the different concrete grades, and the variation in the deformation was restricted by the performance of coral coarse aggregate (CA). However, an increment in the lateral strain was observed with an increase in the axial strain. The lateral stress model showed a good agreement with the experimental data, and the proposed damage-constitutive model had a good correlation with the measured stress−strain curves.

Keywords coral aggregate concrete stress−strain curves lateral effective stress peak stress axial−lateral curves damage-constitutive model.

Corresponding Author(s): Haifeng YANG

Just Accepted Date: 21 December 2022 Online First Date: 23 April 2023 Issue Date: 24 May 2023

Cite this article:

Jiasheng JIANG,Haifeng YANG,Zhiheng DENG, et al. Damage-constitutive model for seawater coral concrete using different stirrup confinements subjected to axial loading[J]. Front. Struct. Civ. Eng., 2023, 17(3): 429-447.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-022-0913-2
https://academic.hep.com.cn/fsce/EN/Y2023/V17/I3/429

type	Cl^?	$S O 4 2 ?$	$H C O 3 ?$	Ca²⁺	Mg²⁺
seawater	18980	2560	142	400	1272

Tab.1 Ionic content of the sea water (unit: mg/L)

Fig.1 Coral aggregates: (a) coral CA; (b) coarse coral sand; (c) fine coral sand.

Fig.2 Grading curves for the aggregates: (a) coral CA; (b) fine coral aggregate.

Tab.2 Physical properties of the CA

Tab.3 Mixture proportions and cubic compressive strength

Fig.3 Section diagrams of the stirrups: (a) JC series; (b) LC series; (c) YC series (unit: mm).

Fig.4 Stirrup diagrams: (a) painted stirrups; (b) stirrup spacing.

Tab.4 Volumetric stirrup ratio

Fig.5 Compressive test: (a) diagram of the YE-1000F; (b) instruments used in the compressive test.

Fig.6 Specimen failure patterns: (a) CC series; (b) JC series; (c) LC series; (d) YC series.

Fig.7 Typical curves and failure patterns of the specimens: (a) typical stress?strain curves; (b) typical stirrups stress?strain curves; (c) diagrams of the failure pattern.

Fig.8 Measured stress?strain curves: (a) CC20; (b) CC30; (c) CC40; (d) JC20; (e) LC20; (f) YC20; (g) JC30; (h) LC30; (i) YC30; (j) JC40; (k) LC40; (l) YC40.

Fig.9 Flowchart for the technical route.

Fig.10 Variation in the peak strength: (a) JC series; (b) LC series; (c) YC series; (d)

f c o t

versus

f c o p

Fig.11 Variation in the residual strength: (a) JC series; (b) LC series; (c) YC series; (d)

f r e o t

versus

f r e o p

Fig.12 Variation of strain: (a) JC series; (b) LC series; (c) YC series; (d)

ε l / ε l c

versus

ε / ε c c

Fig.13 Equivalent column model.

Fig.14 Confined model of the stirrup: (a) diagram of the confined model; (b) diagram of the equivalent springs.

Fig.15 Computational model of k_s.

Fig.16 Calculated model of JC and LC. (a) JC series; (b) LC series.

Fig.17 Calculated model of YC. (a) Section of YC series; (b) diagram of confinement force.

Fig.18 Variation in

σ 3

: (a) typical

σ 3

ε

curves; (b) comparison of

σ 3 p p

and

σ 3 p t

Fig.19 Measured and predicted stress?strain curves: (a) JC20; (b) LC20; (c) YC20; (d) JC30; (e) LC30; (f) YC30; (g) JC40; (h) LC40; (i) YC40.

Fig.20 Different parameters versus s/L₁: (a)

m / m 1

versus s/L₁; (b)

F 0 ′ / F 01 ′

versus s/L₁; (c)

k ′

k 1 ′

versus s/L₁.

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